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CVE-2023-54069

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <fcefddf3a151b2c416b20120c06bb1ba9ad676fb, <f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1, <bc056e7163ac7db945366de219745cf94f32a3e6, 5.10.181, 4.14.316, 0, 5.4.244, 5.4.260, <6.1.61, cec4ef62b36b04e0bc8905732adab091f4bc1cfd, 9d4430b7f862ce8835ca4e054b6916d15c8e0862, 6.1.61, 6.4, 6.3.4, <4.20, <=5.10.*, 46772ab99409cc72241227dd8f5295f358233fda, <58fe961c606c446f5612f6897827b1cac42c2e89, 5.15.138, 6.5.5, <6.4, 6.1.30, 93cdf49f6eca5e23f6546b8f28457b2e6a6961d9, 6.6, fc7237e191b99f88e859316fab2b06c2c26c8344, <=5.4.*, <5.10.200, 4.19.284, 25a60b4533268477920faaeebd99e7e69c0735cd, <5.4.260, <83ecffd40c65844a73c2e93d7c841455786605ac, <5.15.138, <=*, 8659c5f4ffaacbe932849b98462c3d635b4eacea, <=5.15.*, <=6.5.*, 5.15.113, <b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90, 5.10.200, <4.15, 613f6cde5ebb005a37fda117cdda7b4126170c13

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix BUG in ext4_mb_new_inode_pa() due to overflow When we calculate the end position of ext4_free_extent, this position may be exactly where ext4_lblk_t (i.e. uint) overflows. For example, if ac_g_ex.fe_logical is 4294965248 and ac_orig_goal_len is 2048, then the computed end is 0x100000000, which is 0. If ac->ac_o_ex.fe_logical is not the first case of adjusting the best extent, that is, new_bex_end > 0, the following BUG_ON will be triggered: ========================================================= kernel BUG at fs/ext4/mballoc.c:5116! invalid opcode: 0000 [#1] PREEMPT SMP PTI CPU: 3 PID: 673 Comm: xfs_io Tainted: G E 6.5.0-rc1+ #279 RIP: 0010:ext4_mb_new_inode_pa+0xc5/0x430 Call Trace: <TASK> ext4_mb_use_best_found+0x203/0x2f0 ext4_mb_try_best_found+0x163/0x240 ext4_mb_regular_allocator+0x158/0x1550 ext4_mb_new_blocks+0x86a/0xe10 ext4_ext_map_blocks+0xb0c/0x13a0 ext4_map_blocks+0x2cd/0x8f0 ext4_iomap_begin+0x27b/0x400 iomap_iter+0x222/0x3d0 __iomap_dio_rw+0x243/0xcb0 iomap_dio_rw+0x16/0x80 ========================================================= A simple reproducer demonstrating the problem: mkfs.ext4 -F /dev/sda -b 4096 100M mount /dev/sda /tmp/test fallocate -l1M /tmp/test/tmp fallocate -l10M /tmp/test/file fallocate -i -o 1M -l16777203M /tmp/test/file fsstress -d /tmp/test -l 0 -n 100000 -p 8 & sleep 10 && killall -9 fsstress rm -f /tmp/test/tmp xfs_io -c "open -ad /tmp/test/file" -c "pwrite -S 0xff 0 8192" We simply refactor the logic for adjusting the best extent by adding a temporary ext4_free_extent ex and use extent_logical_end() to avoid overflow, which also simplifies the code.

Gravité et risque d'exploitation

CVE-2023-54069 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 10.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <fcefddf3a151b2c416b20120c06bb1ba9ad676fb, <f2c3a3aa6f11ad9878dbc3a067b0633e07b586c1, <bc056e7163ac7db945366de219745cf94f32a3e6, 5.10.181, 4.14.316, 0, 5.4.244, 5.4.260, <6.1.61, cec4ef62b36b04e0bc8905732adab091f4bc1cfd, 9d4430b7f862ce8835ca4e054b6916d15c8e0862, 6.1.61, 6.4, 6.3.4, <4.20, <=5.10.*, 46772ab99409cc72241227dd8f5295f358233fda, <58fe961c606c446f5612f6897827b1cac42c2e89, 5.15.138, 6.5.5, <6.4, 6.1.30, 93cdf49f6eca5e23f6546b8f28457b2e6a6961d9, 6.6, fc7237e191b99f88e859316fab2b06c2c26c8344, <=5.4.*, <5.10.200, 4.19.284, 25a60b4533268477920faaeebd99e7e69c0735cd, <5.4.260, <83ecffd40c65844a73c2e93d7c841455786605ac, <5.15.138, <=*, 8659c5f4ffaacbe932849b98462c3d635b4eacea, <=5.15.*, <=6.5.*, 5.15.113, <b7e9ec38b6a0beb5a49cd1e76be0a9a07c218e90, 5.10.200, <4.15, 613f6cde5ebb005a37fda117cdda7b4126170c13) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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